Metal punching and shearing machine



(No Model.) I

L. 0. HAUBER.

. METAL PUNGHING AND SHEARING MACHINE.

' No. 499,540. Patented June 13, 1893.

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UNITED STATES LOUIS C. HAUBER, OF ST. MARYS,

PATENT OFFICE.

PENNSYLVANIA.

METAL PUNVCHING AND SHEARING MACHINE.

SPECIFICATION forming part of Letters Patent No. 499,540, dated June 13,1893.

Application filed March 25, 1893.

To all whont it may concern:

Be it known that I, LOUIS O. HAUBER, a citizen of the United States, anda resident of St. Marys, in the county of Elk and State of Pennsylvania,have invented certain new and useful Improvements in Metal Punching andShearing Machines; and I do hereby declare that the following is a full,clear, and exact description of the invention, which will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification, and in which- Figure 1 is a side view of a punchingand shearing machine equipped with my improvement. Fig. 2 is a detailView of the relief spring (which constitutes the essential feature of myimprovement) removed from the machine; and Figs. 3 and 4 are detailviews of, respectively, the fastening device and the stirrup used inconjunction with the relief spring.

Like letters of reference denote corresponding parts in all the figures.

This invention relates to metal-working machines, and, more especially,to punching and shearing machines worked by hand, the operation of whichrequires considerable power, and has for its object to facilitate themanipulation of such machines and reduce the power required to operatethem to a minimum.

With this object in view, my improvement consists in the combinationwit-h the main working-lever of the machine of a relief spring andcertain devices for applying the same to the machine, as will behereinafter more fully described and claimed.

Referring to the drawings, the letter A denotes the bed or table of themachine, supported upon stout legs, a, of suitable height.

B is the iron base and frame of the machine proper (which may be of anyapproved type or construction capable of being manipulated by a leverhandle).

C marks the lever or handle for operating the machine; D the socket intowhich the handle is inserted; and E, F are the compound levers, orjointed arms, common to many punching and shearing machines of thistype.

Serial No. 467,633. (No model.)

As I do not, however, claim anything in the construction of the machineper se, a brief reference to these parts (the function of which is wellunderstood by all persons familiar with metal-working machines) is allthat will be necessary.

To the under side of the table, A, I fasten, by a bearing or holder G,one end of a leafspring, H, built up of a suitable number of overlaidleaves, h h, of spring steel, as usual in the construction of suchsprings, for

wagons, for example; the spring being of an attenuated or elongatedS-shape, as shown in the drawings. The fastening device G is composed ofa strap of steel, twisted at its middle, as shown at g, so as to bringits two parts or ends at right angles to each other, each part beingbent at right angles, as shown atfandf'. The upper part or section issecurely fastened to one side of table A by strong screws or bolts, 6,inserted through holes punched in the two right-angled parts of thestrap, and the inner end of spring His fastened in the lower part, orbearing part, of the strap by rivets e, inserted through the rightangled bearingf' and through the inner end of the spring resting uponit. Instead of riveting, other means of fastening the spring to itsbearing may, of course, be adopted, if desired.

The free end of the spring H is inserted through a stirrup, I, the shapeof which is fully illustrated in Fig. 4, and which is fastened to thetable A in the same manner as the bearing-strap G. This stirrup isformed by bending a strap of steel so as to form a rectangular opening,a, through which the spring is inserted so as to take a loose bearingupon or against the under side of, and have some up-and-down playwithin, this stirrup. The free end of the spring projects a considerabledistance, approximately to the end of the table, and has hinged to itsouter end a stirrup, J, which engages an eye, K, at the lower end of theconnecting-rod L, so that the rod L may be unhooked or disengaged fromthe spring if desired. The other end of rod L also has a hook M, whichis hooked upon a headed stud or pin, N, projecting from one side oflever-arm E, at the point or fulcrum where said arm is articulated tothe elbow O of the main working-lever O D, so that the rod L may also beunhooked at that point if it is desired to remove it.

From the foregoing description, taken in connection with the drawings,the function and operation of the relief spring II will be readilyunderstood. The tension or pressure of said spring being downward at itsfree end, as indicated by the arrow shown at that point, willassistcommensurately with the stiffness of the springto pull down uponrod L and the lever-fulcrum N, when lever C is swung back into itsnormal or upright position after punching or cuttinga plate of metal,thereby greatly relieving the reinstatement or replacing of the leverfrom its horizontal position shown in dotted lines to the approximatelyvertical position shown in full lines. During the motions of theelbow-lever O D 0, either when swung down or up, these movements will,in a measure, be guided by the com pound levers E F, one of which (E)forms a continuation of the elbow O at the lower end of the mainoperating lever C D, which carries the fulcrum N, while the other (F)forms a movable support for the other end of said elbowextension orlever E, swinging upon a fulcrum-stud or bearing, F, fastened in oneside of the frame; besides which this lever F serves to operate certainother working-parts of the machine (which, however, form no part of myinvention) to which a reciprocating motion is given by means of a studPwhich plays in a slot, Q, in the lower end of the lever, below itsfulcrum. But as I have already stated at the beginning of myspecification, these connecting levers are common (in combination withthe main elbow -lever O D O) to very many metal-punching and shearingmachines of the same general type; one of the functions of lever Fbeing, as aforesaid, to operate certain parts of the machinesimultaneously with the punching or shearing operation performed bydepressing the handle 0 of the main operating lever. In doing this, theupper end of lever B moves to the left, as indicated by the arrow atthat point, while by again raising the lever-handle, it returns to itsnormal position shown in the drawings. At the same time, the downwardpressure on the lever or handle for punching or shearing is notaugmented in any appreciable degree by the spring which may bedisconnected (by unhooking rod L) when the machine is to be used forcutting a heavy plate.

As I have already pointed out, this improvement may be advantageouslyapplied to all metal-working machines of the type heretofore referredto, in which the punch or shears is (or are) operated by a lever, byconnecting the main-operating lever, on one side of its main fulcrum, toa rod, L, the other end of which is connected to a relief-springoperating to reinstate the lever in its normal upright position arrangedsubstantially as described.

Having thus described my invention, I claim and desire to secure byLetters Patent of the United States- 1. In metal punching and shearingmachines of the described type, the combination with the main-operatinglever O D, having an elbow when arranged and operating substantially asshown, of the relief-sprin g H fastened at one end to the bed of themachine, connected at its free end to a rod, L, connectingit to theelbow of the lever and inserted loosely through a keeper or stirrup, I,intermediate its point of attachment to the bed of the machine andconnection to rod L; substantially as and for the purpose herein shownand set forth.

2. The combination, in a metal -punching and shearing machine of thedescribed type, of the main-operating elbow lever C D, removableconnecting-rod L, and relief spring H, when constructed and combined tooperate substantially in the manner and for the purpose herein shown anddescribed.

In testimony that I claim the foregoing as my own I have hereuntoaffiXed my signature in presence of two witnesses.

LOUIS O. HAUBER.

Witnesses:

FRANK KRAFT, GEORGE 110mm.

